jones



(N0 Modl.) 2 SheetsSheet 1 0. F. JONES. STEAM BOILER FURNACE. No.666,862. Patented Sept. 1, 1896.

(No Model.) 2 Sheets-Sheet 2 O. P. JONES.

STEAM BOILER FURNACE.

No. 566,862. Patented Sept. 1, 1896.

lllllll UNITED STATES PATENT tries.

OLIVER F. JONES, OF CINCINNATI, OHIO, ASSIGNOR OF ONE-HALF TO W. P.BRUCE, OF SAME PLACE.

STEAM-BOILER FURNACE.

SPECIFICATION forming part of Letters Patent No. 566,862, datedSeptember 1, 1896.

Application filed August 14, 1895. Serial No. 559,273. (No model.)

To all whom it may concern;

Be it known that I, OLIVER F. JONES, a citizen of the United States,residing at Oincinnat-i, Ohio, have invented new and useful Improvementsin Steam-Boiler and other Furnaces, of which the following is aspecification.

My invention relates to steam-boiler and other furnaces, its objectbeing to provide a construction for the automatic uniform feeding of thefuel and for the perfect, uniform, and economical combustion of thesame, with a View to obtain the best results in the use of bituminouscoals, including the prevention of smoke, &c.

To this end my invention consists in the combination, with theboiler-furnace, of a central grate extending from the fire-door rearward to the bridgewall and feed-troughs at each side, into which thefuel is conveyed or fed by a screw conveyor, whence it overflows towardthe center upon the grate. In connection with these I employ perforatedair-feeding conduits extending the length of the feeding-troughs at eachside, discharging at an upward inclination through the masses of fuel.These, together with the auxiliary attachments and actuating mechanism,constitute the main features of the invention hereinafter more fullydescribed.

My invention is embodied in the apparatus exhibited in the accompanyingdrawings, in which Figure 1 is a side elevation in section of theimprovement as applied to a steam-boiler furnace. Fig. 2 is a frontelevation. Fig. 3 is a plan view showing the feeding-troughs, grate, andfuel-conveyors. Fig. 4; is a crosssection taken through thefeeding-troughs.

Referring now to the drawings, A designates a steam-boiler of theordinary cylindrical type; B, the bridge-wall; B, the front wall, and BB the side walls, respectively, of the ordinary brick setting. As theobject of these illustrations is to show the invention as applied toexisting circumstances and a familiar type of boiler-setting, it will besufficient to say that these parts are of the ordinary construction. Inlieu of the ordinary grate occupyingthe entire space between the sidewalls B 13 I employ a central relatively narrow grate G, flanked at thesides by fuel-troughs D D, extending from the front wall B to thebridge-wall B.

The troughs are preferably of cast-iron and arranged below the generallevel of the grate O, are closed at the sides and bottom, and open atthe level of the grate. The front wall of each trough is pierced for thepassage of fuel, and the bottoms are inclined thence upwardly to therear. The troughs present a somewhat U shaped cross-section curved atthe bottom, having a substantially vertical wall d at the outer side andan outwardly-inclined wall 01- at the inner side. At the level of thegrate, at the sides of each trough D, are air-dis charging conduits E Eprovided each with a continuous slit adapted to discharge at an upwardin olination over the top of the trough. The conduits E E communicate atthe rear with a suitable passage E arranged, as may be convenient, in orin connection with the furnace-walls and provided with a blower (notshown) for forcing heated air through the discharge-conduits.

To the perforated front of each trough and extending through the furnace-wall B is bolted a cylindrical extension F, provided with a screwconveyor f and with a feedinghopper H, connected to a forward opening atthe upper side of each extension. The shaft of the conveyor extendsthrough its bearing in the front wall of the extension, and is providedwith suitable appliances for the application of driving power. In thepresent instance I have shown as the driving means upon each shaft aworm-gear g, driven by a worm-shaft g, meshing with both gearssimultaneously. At the rear the shaft of the conveyer f is carriedthrough the bottom of the trough to a bearing f at the under side.

The blower hereinbefore referred to and the worm -shaft above describedare to be driven by any suitable source of power. (Not shown.)

I prefer to construct the grate C as a tilting grate -carried upon afore-and-aft pivot c-which may be shaken upon occasion to discharge theaccumulated refuse or turned to dump the contents into the ash-pitbelow.

The operation of the device is as follows: The green fuel is fed fromthe hoppers H and carried into the troughs equally by the conveyers f.As the fuel is pushed backward it is gradually piled upward and fallsover upon the grates, the slope of the inner wall of each troughassisting this distribution. The position of the fuel is indicated bythe irregular lines in Fig. at. The surface of the fuel-pile is keptignited by the heat of the furnace, and the combustion is intensified bythe action of the air-blasts through the pipes E E issuing as indicatedby the arrows z, directed outward and upward from each side of thetrough, intensifying the combustion of the incandescent mass at thesurface. The effect of these blasts is also to draw air through theash-pit and grate O by producing a partial vacuum at the center of thefurnace above the grate, tending also to produce the double returncurrents indicated by the arrows 2. It will be seen that the gases ofcombustion are thus brought immediately above the partially spent andhottest coals at the center of the furnace, and thus thorough combustionis effected. It will also be observed that by the form and position ofthe fuel-piles rising at each side a general throat or passage throughthe furnace, approximately parallel to the curvature of the boiler, ismaintained, by which the heated gases are brought into close contactwith the under side of the boiler. Thus the ordinary cooling effect ofthe side walls is obviated and the greatest heat maintained at thecenter. Moreover, by the maintenance of an incandescent surface over thefuel-piles at the sides the fuel immediately beneathis coked, so thatthe fuel, as it gradually works outward and downward toward the grate,is partially coked before it reaches actual combustion and is completelycoked before its greatest inoandescence. Thus the formation of clinkersis prevented and the entire heat-producing elements of the fuel arethoroughly utilized. I may also employ curved projections of the sidewalls, as shown at m, Fig. 4:, as deflectors to assist in turning theair-currents inward and downward toward the center of thecombustion-chamber in order to avoid the cooling effects of the recessesat the angle between the boiler and the side walls.

I claim as my invention and desire to secure by Letters Patent of theUnited States 1. In a steam-boiler or other furnace, in combination witha central grate, two fueltroughs arranged one at each side adjacent tothe side walls of the setting and means for forcing fuel into thetroughs below the gratelevel and compelling the same to bank against theside walls and overflow upon the grate, producing a throat or passagethrough the furnace, having greatest depth at the center and incliningthence upward and outward to the sides, substantially as set forth.

2. In a steam-boiler or other furnace, in combination with a centralgrate and fueltroughs intervening between the same and the side walls,air-blast conduits arranged alongside of each fuel-trough arranged todischarge upwardly at an inclination over the fuel-trough, substantiallyas set forth.

3. In a steam-boiler furnace, in combination with a central grate, fuelcontaining and feeding troughs flanking the grate at each side, arrangedbelow and opening at the gratelevel, each having a substantiallyvertical outer wall and an inner wall inclined inward toward the grate,substantially as set forth.

4. In a steam-boiler furnace, in combination with a central grate, fuelcontaining and feeding troughs flanking the grate at each side, arrangedbelow and opening at the gratelevel, each having a bottom inclinedupward from front to rear, substantially as set forth.

5. In a steam-boiler furnace, a fuel, containing and feeding trough,adapted to rest and operate at the side of the grate, said trough havinga bottom inclined upward from front to rear, substantially verticalouter side walls, and inner walls inclined outwardly, and a fuel-feeding aperture through the front wall, whereby the mass of fuel fed inwardfrom the front tends to discharge its excess over and upon the grateadjacent to the inclined side walls, substantially as set forth.

6. In a steam-boiler furnace, in combination with a central grate andside troughs adapted to contain and accumulate the fuel in a mass whosesurface is inclined outwardly and upwardly from the grate, twoair-discharging conduits arranged at the sides of and parallel with eachtrough, one of which discharges at an inclination approximately parallelwith the surface of the mass of fuel, and the other directly throughsaid mass, substantially as set forth.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

OLIVER F. JONES.

Witnesses:

L. M. IIOSEA, FRANK K. BOWMAN.

